[1]郑紫星,黄春长*,赵 辉,等.青海喇家遗址全新世中期土壤与泥流沉积物地球化学特征[J].山地学报,2018,(01):1-12.[doi:10.16089/j.cnki.1008-2786.000295]
　ZHENG Zixing,HUANG Chunchang*,ZHAO Hui,et al.Geochemical Characteristics of the Mid-Holocene Palaeosol and Mudflow Deposits in the Lajia Ruins of Qinghai Province[J].Mountain Research,2018,(01):1-12.[doi:10.16089/j.cnki.1008-2786.000295]
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青海喇家遗址全新世中期土壤与泥流沉积物地球化学特征()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2018年01期
页码:
1-12
栏目:
山地环境
出版日期:
2018-01-30

文章信息/Info

Title:
Geochemical Characteristics of the Mid-Holocene Palaeosol and Mudflow Deposits in the Lajia Ruins of Qinghai Province
文章编号:
1008-2786-(2018)1-001-12
作者:
郑紫星1;  黄春长1*;  赵 辉1;  郭永强1; 2;  周亚利1
1.陕西师范大学 地理科学与旅游学院,西安 710062; 2.中国科学院、水利部成都山地灾害与环境研究所,成都 610041
Author(s):
ZHENG Zixing1 ;  HUANG Chunchang1*;  ZHAO Hui1 ;  GUO Yongqiang1; 2 ;  ZHOU Yali1
1.School of Geography and Tourism, Shaanxi Normal University, Xi'an, Shaanxi 710062, China; 2.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
关键词:
喇家遗址;  古土壤;  红色粘土;  泥流;  化学元素
Keywords:
Lajia Ruins;  Chernozem soil;  red clay;  mudflow;  chemical composition
分类号:
P532
DOI:
10.16089/j.cnki.1008-2786.000295
文献标志码:
A
摘要:
通过对青海官亭盆地详细的野外考察, 在民和县喇家遗址北部发现了典型的全新世中期风成黄土古土壤剖面。经过详细的野外考察、系统采样和地球化学元素分析、粒度、磁化率等指标测定, 从剖面中初步鉴别出两组红粘土质泥流沉积层(RC1、RC2), 分别记录了发生在3850 a B.P.至3600 a B.P.期间的两场大型泥流事件。该研究主要对剖面中两层红色粘土质泥流沉积层与古土壤层以及岗沟源区沉积物的地球化学性质进行对比研究。结果表明:(1)两层红粘土层均为喇家遗址后山沟源区域的暴雨山洪泥流堆积物,粘土质细粉沙质地,层次混乱, 随古地面地形起伏变化, 含沙石、黄土团块、陶片和木炭屑等。(2)单个泥流堆积层中,元素含量变化剧烈且有极值出现,这是多次暴雨泥流间歇性发生的有力证据。(3)两层红色粘土层与岗沟源区第三纪红粘土的理化特征都极为相近,据此,可推断出该剖面中两层红粘土层均源自北侧谷坡大红山(第三纪红色粘土)地区的大规模暴雨山洪泥流。这些研究成果对于深入理解黄河上游地区史前环境变化及其产生的自然灾害、人类活动之间的关系具有重大的科学价值。
Abstract:
The Lajia Ruins in the Guanting Basin, is a product of the prehistoric Qijia Culture.Archaeological excavations have exposed extraordinary pictures of natural disasters that destroyed their settlements and claimed the lives of many people.However, the causation of the prehistoric disasters is of great controversy.Many studies focus on the understanding of the disaster, but lack of detailed geochemical characteristics.Field investigations were carried out in the Guanting Basin in the upper Yellow River valley.A Mid-Holocene palaeosol sequence was identified in the northwest part of the Lajia Ruins.After detailed field observations, pedostratigraphic subdivisions and descriptions, samples were collected systematically and the chemical composition, grain-size distribution and magnetic susceptibility were measured in the laboratory.All of these indexes show that there are two layers of conglomerated red clay inserted into the soil of the mid-Holocene.They were dated to around 3850 a BP and aroud 3600 a BP, respectively, using the 14C method.A comparative study of geochemical features of conglomerated red clay, the eolian soil, and gully deposits at the foot of the Great Red Hills reveals that:(1)Two layers of conglomerated red clay classified as the deposits of dense mudflows in connection with rainstorms over the gulley heads.Both of which are silty clay with rolling, wavy and conglomerated structure, very firm, with some stones, earth clods and human remains, including pottery shards, burnt earth, ash and charcoal, etc.(2)In each of the mudflow deposit bed, major elements also exhibit significant change indicative of the multipled mudflows occuring intermittently.(3)The physico-chemical characteristics of the two red clay layers resemble to those of the Tertiary red clay deposits over the gully heads in the Great Red Hills.Therefore, such a conclusion can be deduced: these two layers of conglomerated red clay were deposited by flash floods and mudflows from the gully heads behind the Lajia Ruins where the high hills consist of the unconsolidated Tertiary red clay formation.These findings are of great importance in understanding prehistorical environmental change, natural disasters and the human impact over the upper Yellow River basin.

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相似文献/References:

[1]张信宝.青海民和喇家遗址的古地震与古溃决洪水质疑[J].山地学报,2017,(03):255.[doi:10.16089/j.cnki.1008-2786.000219]

备注/Memo

备注/Memo:
收稿日期(Received date):2017-09-30; 改回日期(Accepted date): 2017-11-29
基金项目(Foundation item):国家自然科学基金面上项目(41771110)。 [National Nature Science Foundation of China(41771110)]]
作者简介(Biography):郑紫星(1993-),女,山西大同人,硕士研究生,研究方向为资源开发与环境演变。[Zheng Zixing(1993-),female,born in Datong,Shanxi,M.Sc.candidate,major in resource development & environment evolvement.] E-mail: zhengzx1211@163.com
*通讯作者(Corresponding author):黄春长(1953-),男,陕西彬县人,教授,博导,主要从事全新世环境变化与人地关系演变研究。[Huang Chunchang(1953-),male,born in Shannxi,professor,research fields cover climate change during the Holocene,and human-natural relationship evolution study.] E-mail:cchuang@snnu.edu.cn
更新日期/Last Update: 2018-01-30